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“If you're going to practice divide and rule to maintain some sort of equilibrium at ONI, it's not enough to just set people against one another. The trick is to make sure that you get some useful work out of them as well. Otherwise just dispose of them and save yourself some time.”

In 2511, Parangosky restricted the planet Onyx from the rest of the UNSC after Forerunner ruins were discovered on the surface of the planet that same year.[4]She presumably ignored a Geological Expedition Team's request to conduct further surveys on Onyx as well. She returned several times to check up on and report on the project; however, with nothing to show for its efforts, the project was eventually sidelined in 2525 so that funding could go elsewhere.[2]

In 2537, Parangosky went aboard the Point of No Return to review the progress of the SPARTAN-III program and to authorize the formation of Beta Company, following the recent destruction of Alpha Company in Operation: PROMETHEUS.[8]

By 2552, Parangosky had risen to rank of admiral and was named the head of the Office of Naval Intelligence. She continued working aboard the Point of No Return, green-lighting some of humanity's most controversial projects.[6] At one point, she adopted the "washed-out" SPARTAN-II candidate Serin Osman as her protégé, grooming her to be her successor. It was noted that Osman is almost like a "granddaughter figure" to Parangosky, and one of the few people she cared about.[9] By late March 2553, she was on the verge of retiring and planned to recommend Osman as her replacement. When Jul 'Mdama escaped she went to Shield World Trevelyan to arrest Dr. Magnusson and replaced her with Magnusson's aide Hugo Barton.
As of March 2555, Serin Osman had been promoted to Admiral and was head of ONI following Admiral Parangosky's resignation.[10]

Even though she was in her nineties, Parangosky still had a very strong and determined personality. She was quite calculating, never doing anything without a clear purpose and outcome. She recognized that she had done questionable and even inhumane things during her career, but was confident that what she did allowed more people to survive than had she acted otherwise. She was feared throughout the UNSC, with soldiers even referring to that fear as "Parangosky-itis."

Her name is seen on a memorial plaque inside the ONI Alpha Site on Earth. As the Halo Encyclopedia states that she was still alive and on board the Point of No Return at that time and a reference to Parangosky is made in a transcript of the psychological evaluation of Frederic-104 during the start of the invasion of Earth in the 2010 re-release of Halo: First Strike. This is obviously an ONI cover up as she appears in Glasslands and Thursday War.

Her motto is "Strength through Paranoia."

She is stated to prefer the speed and maneuverability of a frigate to the brute strength of a flagship.